Snoop observed that his copper bracelet developed a greenish coating after some time. What could be the reason for this? Support your answer with the help of a chemical equation.

Open in App

Solution

Copper metal when exposed to air turns green in colour due to corrosion.

When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.

The reaction is as follows:
2Cu + H2O + CO2 + O2 → Cu(OH)2 + CuCO3

Suggest Corrections

Similar questions

On heating copper powder in air the surface of copper powder becomes coated with black CuO . How can this black coating be converted into brown copper? Write a chemical equation for the reaction that occurs during the colour change.

Q. A small piece of aluminium metal was placed in a beaker containing a greenish solution. After some time, a grey coating was observed on the aluminium piece. The greenish solution is most likely to be :
(1) salt solution of copper metal
(2) salt solution of iron metal
(3) salt solution of zinc metal
(4) salt solution of aluminium metal

Q. If copper is exposed to wet air for an extended period, it develops a greenish coating. Why?

Q. A piece of zinc foil was dipped into a beaker containing copper sulphte solution.The reactants were left for an hour to allow them to react.
(a) Write a balanced chemical equation to represent this reaction.
(b)What is this reactions called? Define the reaction.
(c)What would you observed if a piece of silver metal was dipped into the copper sulphate solution instead of zinc ? Give reason for your answer.

Q. With the passing time, wildlife extinction is being observed at higher rate. What could be the possible reasons for this?

Join BYJU'S Learning Program